[    2.565111] ------------[ cut here ]------------
[    2.565287] refcount_t: underflow; use-after-free.
[    2.565382] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.565530] Modules linked in:
[    2.565585] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.565672] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.565749] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.565824] Code: 95 e8 18 df ba ff 90 0f 0b 90 90 c3 80 3d 79 c9 eb 00 00 75 89 c6 05 70 c9 eb 00 01 90 48 c7 c7 f0 8d 31 95 e8 f5 de ba ff 90 <0f> 0b 90 90 c3 80 3d 54 c9 eb 00 00 0f 85 62 ff ff ff c6 05 47 c9
[    2.565976] RSP: 0018:ffffa4f100597e50 EFLAGS: 00010286
[    2.566050] RAX: 0000000000000000 RBX: ffffa4f100597e60 RCX: 00000000ffffdfff
[    2.566143] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.566237] RBP: ffffa4f100597988 R08: ffffffff95756a28 R09: 00000000ffffdfff
[    2.566348] R10: ffffffff95676a40 R11: ffffffff95726a40 R12: dead000000000122
[    2.566446] R13: 00000000fffb7591 R14: 0000000000000001 R15: ffff991a04544000
[    2.566534] FS:  0000000001b383c0(0000) GS:ffff991aa8ee6000(0000) knlGS:0000000000000000
[    2.566609] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.566672] CR2: 00007f7bce6d5000 CR3: 00000000045ad001 CR4: 0000000000772ef0
[    2.566796] PKRU: 55555554
[    2.566821] Call Trace:
[    2.566895]  <TASK>
[    2.566962]  netdev_run_todo+0x21a/0x550
[    2.567050]  ? __tun_detach+0x2ed/0x490
[    2.567141]  tun_chr_close+0x47/0xa0
[    2.567229]  __fput+0xda/0x290
[    2.567299]  __x64_sys_close+0x3d/0x80
[    2.567367]  do_syscall_64+0xa4/0xfd0
[    2.567440]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.567554] RIP: 0033:0x4901eb
[    2.567608] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
[    2.567749] RSP: 002b:00007ffcc2665500 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.567839] RAX: ffffffffffffffda RBX: 00007ffcc2665a58 RCX: 00000000004901eb
[    2.567924] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.567997] RBP: 00007ffcc2665540 R08: 0000000000000000 R09: 0000000000000000
[    2.568075] R10: 0000000000000004 R11: 0000000000000293 R12: 00007ffcc26659d8
[    2.568150] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.568238]  </TASK>
[    2.568301] ---[ end trace 0000000000000000 ]---